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classical music concerts, classical music performances, community orchestra, orchestra music, chamber music, contra costa orchestra, chamber orchestra concert, chamber orchestra performance, Contra Costa classical music, East Bay classical music, Bay Area classical music, San Francisco Bay Area, Bay Area, East Bay, Contra Costa County, Walnut Creek, Lafayette, Orinda, Moraga, Concord, Clayton, Crockett, San Ramon, Danville, Discovery Bay, Alamo, Blackhawk, Antioch, Pleasant Hill, Pittsburg, Bay Point, Brentwood, Oakley, Bethel Island, Richmond, El Cerrito, El Sobrante, Hercules, Pinole, San Pablo, Kensington, Martinez, Oakland, Berkeley The Contra Costa Chamber Orchestra is a community orchestra that has provided quality classical music concerts for over 30 years. This Contra Costa orchestra performs all types of orchestra music and chamber music.